What is Internet Key Exchange version 2 (IKEv2)? How to configure IKEv2?
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IKEv2 phase 2 is also known as child mode. the IKEv2 initiator sends a CREATE_CHILD_SA request, containing a list of acceptable proposals for the child SA.
R3#show crypto ikev2 session
IPv4 Crypto IKEv2 Session
Session-id:1, Status:UP-ACTIVE, IKE count:1, CHILD count:1
Tunnel-id Local Remote fvrf/ivrf Status
1 192.168.31.1/500 192.168.123.1/500 none/none READY
Encr: 3DES, Hash: SHA96, DH Grp:5, Auth sign: PSK, Auth verify: PSK
Life/Active Time: 86400/2923 sec
Child sa: local selector 192.168.30.0/0 - 192.168.30.255/65535
remote selector 192.168.10.0/0 - 192.168.10.255/65535
ESP spi in/out: 0xCF0FA2FE/0x5AAC2F32
IPv6 Crypto IKEv2 Session
The attributes that can be negotiated include the following:
Protocol (AH 0r ESP) AH, and ESP are the two protocols we use to protect user data. Both of them can be used in transport or tunnel mode, let’s see all the possible options.
Encapsulation mode (tunnel or transport) Transport mode is very simple, it just adds an AH header just after the IP header. Here’s an example of an IP packet that carries some TCP traffic:
Encryption algorithm (for example DES,3DES, or AES)
Authentication algorithm (for example, HMAC-MD5 or HMAC-SHA) peers have to show their identity to prove who he is. Peers use shared keys or digital certificates.
Diffle-hellman group information (for example, group 1, group 2, group 5, or group 14) DH group determines how strong the key is and how it's used in the exchange process of the key. The higher number means more secure but it takes longer to compute.
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